socket通讯简化例子

openSUSE 2.6 X86_64 下测试通过

 

1 服务器端简化.

#include "stdio.h"
#include "stdlib.h"
#include "string.h"
#include "netdb.h"

int main(int argc, char *argv[])
{
    int servfd, clifd;
    struct sockaddr_in servaddr, cliaddr;

    if((servfd = socket(AF_INET, SOCK_STREAM,0)) < 0) return;

    bzero(&servaddr, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_port = htons(7777);
    servaddr.sin_addr.s_addr = htons(INADDR_ANY);

    if(bind(servfd, (struct sockaddr*)&servaddr, sizeof(servaddr))<0) return;
    if(listen(servfd, 24) < 0) return;

    while(1)
    {
        socklen_t length = sizeof(cliaddr);
        if((clifd = accept(servfd, (struct sockaddr*)&cliaddr, &length)) < 0) continue;

        #define BUFFER_SIZE 4096
        int lenth = 0;
        char sreceive[BUFFER_SIZE];
        char ssend[BUFFER_SIZE];

        if((lenth = recv(clifd, sreceive, BUFFER_SIZE,0)) > 0)
        {
            printf("[receive]%s\n", sreceive);
            sprintf(ssend,"hello.\n");
            send(clifd, ssend, strlen(ssend),0);
        }

        close(clifd);
    }

    close(servfd);
}

 

2 客户端简化.

char shost[128] = "";
char sport[64] = "80";

//socket
struct hostent *host;
int portnumber,nbytes;

if( ( host = gethostbyname( shost)) == NULL) return 0;
if( ( portnumber = atoi( sport)) < 0) return 0;

int sockfd;
struct sockaddr_in server_addr;
if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
    return 0;

bzero(&server_addr,sizeof(server_addr));
server_addr.sin_family=AF_INET;
server_addr.sin_port=htons(portnumber);
server_addr.sin_addr=*((struct in_addr *)host->h_addr);

//select interval
struct timeval timeo = {3, 0};
socklen_t len = sizeof(timeo);
setsockopt(sockfd, SOL_SOCKET, SO_SNDTIMEO, &timeo, len);

//connect
if(connect(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1)
{
    printf("connect out time.\n");
  return 0;
}

//send
char oRequest[256] = "some thing.";
if((nbytes = send( sockfd, oRequest, strlen(oRequest), 0)) == -1)
{
    printf("send out time.\n");
  return 0;
}

//read
char result[10240];
char tmp[1024];
memset( result, 0x0, sizeof(result));

int cnt = 0;
while( ( nbytes= read( sockfd, tmp, sizeof(result) - 1) ) > 0 )
{
    cnt += nbytes;
    if( cnt < sizeof(result))
        strcat( result, tmp);
    else
        return 0;
}

printf("[%s]\n", result);
close(sockfd);